The answer is NO open circle is not included in an inequality. The other person answered it incorrectly
Answer:
1/2
Step-by-step explanation:
since 10petrols=1 oil
therefore 5petrols=1/2
<u>ANSWER</u>

<u>EXPLANATION</u>
The given series

This is an arithmetic series with a common difference of

The first term of the series is:

The general term is given by:




The last term is 81
We can use this to determine the number of terms in the series.




The summation notation is:

Height at 3 sec: 15 meters
Max height: 20 meters